What gas? Gas is an invisible form so I don't see how it would have a "defined structure".
Answer:
e = Δφ / Δt induced emf is proportional to enclosed flux
Also φ = B * A flux is proportional to area and enclosed field
If the induced emf e increases with time than the flux and hence the magnetic field is increasing with time (replace B with G)
Since e = ΔG * A / Δt if e is linear then G must also be linear and be proportional to the time
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failure of the anchovy harvest in 1972 was blamed on El Niño.</span>
